changing the width of report parameter of a custom report in ms crm 4.0

Hai,

I've a report with the drop down as report parameter for a custom report. The text is very lengthy, so i'm getting scroll bars for the drop down. I want to increase the width of the drop down. Can any one let me know how can we do this.

I'm using MS CRM 4.0 with reporting server 2005.

Please let me know its very important.